Zeiss WL interference research microscope, with interference equipment and transformer, by Carl Zeiss, German, 1970-1975 Zeiss WL interference research microscope 1970-1975
Orthoplan interference microscope, trinocular, with interference contrast optical equipment designed by Smith, made by Leitz, Wetzlar, German, 1961-1970 Orthoplan interference microscope 1961-1970